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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd4eed6677d31af19249e4b664d40709a1f12e52fc12d576056efa065c0de7d' 
  AND token = '2qJZef7O3SVOtgZsMZouA+MxhzyR/q81R1kaVYcLKqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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