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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d15528b608c7ba22d038958c4f90a99b1b62e6e4b35a64619704cd7e0abcf8' 
  AND token = 'US6Rc6l7dLZKAOPJ3cWXO8wmjnkFil9NomqSDN2R3K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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