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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b733ad1b3548632db1dd587162745a2865601e403a1397184a99504d0e8a588' 
  AND token = '15lVjDjqP/+Ls6CG4Jlw35suusugE19bF0APAvKdtkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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