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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb0f63d48f96d8747f5bd03bb5a7f90277516d00bbc61ae22eba3eb57065c16' 
  AND token = '7oZkLUzQwbjr1xD6knNr6TWUfM7l+r0mEdBuhiqEyEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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