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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940a7c87f8272cf30b6094732dd20b11f7f01acdaee15812e6d65ed8f6ae083d' 
  AND token = 'gddIDB4TVetwQX7xy5Lrw/YN2AaIyLM2TWZcj03fZ6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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