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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64ceac041ebf697f276a7b7bedd7aebcba186af2edefe16e3c5b8c20528384a' 
  AND token = 'cpuPGXXFGX4Emr2DwYS/KKKWpmOaTuAA22l61C07yQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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