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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '166e24b80f713eee88791591f8a3038c8ee3bdc3a0b8c2a5868793320aab606e' 
  AND token = '5t8k4E8hPbVEBQkNICfozpuVxsLpJe6BD+9zCoPx2io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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