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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc800df9ab4b8c10461ccd06f84b4f6d4b9c0b2cdaa0fb92dc7f4ad9189a4667' 
  AND token = 'Yz/D55leEucCcWJZc/JOI0tWSc/ObW2qhKSDI6gOD38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00123

JSON explain

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