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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b0adc81e5f92087e8ce5c4ae07aa34e3c1cc3eba4ecd1701177180e8579e7ca' 
  AND token = 'dHw/MRBjcR9RJZCTfMcXYj73IarWma33M2/aZmuaDbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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