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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef80b70a9cb925b79fb8e4a441a9ca951b2d5a8259d24f4d567bf8d4ad46dd0' 
  AND token = 'dYgTHZgPo3Meb4EjqdxjKZ9eB0E7rGSdH80K70RImE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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