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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23ebc2b55c0e7c5a6de23679d26d835cd22273bdb3ac265c832ea4cc4db8592' 
  AND token = 'Ky8mZNJwLKYl+g4pco1LCWLbJ9H/eZRjBZ9w5vROOT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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