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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3431f98ae92ecb7705c639cdeee20e9fa66d66ab989f0a86d1a904d8533a496c' 
  AND token = '+D0ukCUBXrrnyuuZ26rvyddGjzrcoJAfCqt10+7HnIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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