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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbfe6f95eace774db0a81724f7f98c5c26c8e085226413f33d1d39832318f3c' 
  AND token = '9qlzn+54SqFp3X0cu/8r+qo3l5p2zzNTR5rfDUdmK9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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