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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1810eef321e16d45f841f8e9534b176d25380356dda836b3332947ca6b1cc3ed' 
  AND token = '2jSjPMvc3Ux4L/6fS2ahbWYQdv3Su8fxDE3Ze2RKfcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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