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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7bf2bd7259852d4e61ba74c2dad547f8c6bd0c0c772b534eec5fcc9df84b5cd' 
  AND token = 'px3oHaitD40xHTKFkUEI1/PkrA8fM9a1xl4wti8Vkrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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