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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea11e3e4161d921a6a72ee9d1688e2dc58e1afc101530ad58eac26aea649dab' 
  AND token = 'wQ5qE16NaybQJ0TUJBLxluPBEbvrcBpkw/X2WHXN5wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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