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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e737f84764b43e2406f0a15ae44dacb0f4cfdcc2479bf16d8608d4cf965cf930' 
  AND token = '1q5wbU0Dq0yaFB8fq+VzKPY3YYWhcYViQ2vTk8zEsHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}