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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3696f5b1fc04ee1df601a6bb2a932c7c065afa841e92523cd7e42e46382646c7' 
  AND token = 'Jb72m8LOpSzb3JXSsQYv8EqqNj1E3Kab9awxvgEZt1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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