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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b534271982d45536722839eb075b739c9761ecf32c7a5821d16f42d3b0486a19' 
  AND token = 'Y3UzAxBb55SG9xpXHNj6k7dB7CCWSfySsgOrpZW5L4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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