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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ed718d2a1f84c082a367d548714cc73940226edecc3a87fb05053f12982fd0' 
  AND token = 'gxrdhu2skZeIony10PuG2H801J/IuSQCunhPMaK7rl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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