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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c5c1b876278f037c34582477df39c8745bdce19e1a20f2d0ff042f69f28a06' 
  AND token = 'rNm6mK2OuNHjyo4Flu10Vg3/A1EiS1KF5QuxJnFIdRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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