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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c609d5098eec4336315a637ca01b5ae9a909c62715c511c41cf23d0a81ac632' 
  AND token = '+kp+GIMel4pJD0jVsC7lALfFm/CXyQFfpt9S1y7vpmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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