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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a345c1196f6d45082524b1956c99ac4d148825f96a7c2e4c355543095fda1a39' 
  AND token = '7D7aH1Hq+QssXyElPG0qmXM74OqjmBoFb4L9wDFG4Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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