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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509c3b1d691cf45c580367b2cb3e84c8260a202329358e91381836bc17cea207' 
  AND token = '98E/GjsdMFMeXPJXdNDnAJXpwpiP6V4qs2dfiR0w9q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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