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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a34d790a34238667db4c7b687c6811af009b1dc714f00ac49d36f932572d8c' 
  AND token = '3idb/0YO8ev4D4dO0262uZJjhqx5hfFreZ6a2a3o2VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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