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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7265807fcb047bb140ce2a2e7c5226ff44c9927633f068d5a46f3db62eba162' 
  AND token = 'pEH/PKZAP+1Zc+zm0jxx9Gu0qe+GPU9Y9tyxa6TQHp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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