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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d205abfcac8a3f943e657d94a01cf849998b3c4d375088119896c80ca86158' 
  AND token = 'Xi6wKr2bQveX3gZNceY1KEY62JblKh5VgthvyYQMs/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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