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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03fa2dee8e6016572f04ddfe2cde7aebcde863536adee8062f1a9fa4e1fd8c52' 
  AND token = '+oSVZeLcsx5+sSfmvgSyJV+2EdLJaXYQs0YYyonuy8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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