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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aacaa178ebc7646c18e6ae85acccc4665eca5bc4092df3d862c6795580c4ee0' 
  AND token = '511ZoxEhWRO0Axvg/QhGcHtrr13B1vW5ual46Vu9vMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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