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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7271ab20ae6539818f859deea6c662eae92464399324e2555a2b86ff55f148' 
  AND token = 'Fh/bk3myv9nBV3cuClGapiDMcHllCrYO/r8zMZ4wRao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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