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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a152d364917e2f97d917de9fd78be20fbc7a9a04cbd8e27444c6308e4b99ae3b' 
  AND token = 'xDDikq8EaGW3t5hTURpVzALG/3xfljKdljYB0aAtp/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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