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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f16a2b3c7029da04c8fdc2b55bebb137f03424131685775cd3e34479c11b453' 
  AND token = 'kYy/MbEcMeGPM3Xt2+sXNbnn8KSWlSg9c2ndzkcWh8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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