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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42f85508b78dc3693443d4e6ac991c76bd0acbe0f2d485000710c8ffa26fb9d7' 
  AND token = 'aP1Bs5S7LFcNP99pQezQHPfSysDw9geL9lkuLNmXBW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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