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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4dd45a64312dd5db9c46df0da3a19f1ac49e63c8d3d951246a5320bf1a9d9ab' 
  AND token = 'RWa8VMTnzgU3cuJIaCBY/LGEsvYgso11b0sq1nC5dH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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