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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264e7903bd3e9f101483d8b47ce9a3dccbbbbee82c0b523a2b4b31a98c61779a' 
  AND token = 'RHQ94G3Xzo9J+LFdxikz643Qy/IIjDxEoN8s/jlHGw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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