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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ad9ffb5cde330b22852bb2b5a51f81ae9a9dc0dd2711cb4e6d9e30fa0cc91b' 
  AND token = '6JnJV9CMrzVQUs2TGmaA2DmGKegW4P6vUdpUp4EXPlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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