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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3f1c2acb5704a451d06715347eb872f7bc7d1155249cdf4ffa334be1902274' 
  AND token = 'o1hKNEWMHfpKE3MMg2tp4AfInJd2/lhoinUUqEf2/JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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