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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68098914d4d8d27400e4eea75a62bdffd320425956f98542981166a2f058573a' 
  AND token = 'Iu1zF8XO6uTRIDYzrM+9wXpn0M9Aj3I6A+4sVI7Cri0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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