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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57769081d86b27b1c0c933ed614e876a1c9ab30f1556e872b5bfa0a59296c060' 
  AND token = '9THPz4pTjJEzu709FLV9TVEDrCGEuD+5cny+Ouf6RUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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