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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25420dd7763803869a82908b5e48f36509373096b73bd7fa8ef2d04c1fe6aee0' 
  AND token = 'OctAiC6YPt0D2x9PJyJE6Uq3rbQYWHKfLlKH66CpLD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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