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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce2040290558d0d63695d9e04cc1cbb837d16511a794e53047242f84507fd91' 
  AND token = 'PxuPB9nl52sv9LH6gGBmUWmHmJbaV0P/vvxlTMIU82Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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