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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb84a7dd9e2aa576fb0936c5303559e42a563c0766e114f71ffbf79c82f0f89f' 
  AND token = 't+cd41xfJQ+zS1DzNHH3dVRg/16EnKKdet14QYkGBHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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