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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef94d5804084bb47ae1f8eab112854295191cd4048f9027b9c408c6d8d7c538' 
  AND token = 'K25KhlZuQDdXEBacJI1DUwmbk6NBMTCRfz+9i7Jqs14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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