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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7598b82855cbfe81a640e6ff86c6a700eb6c68e1f3d8c8f13fe55f78dc59f70f' 
  AND token = 'uLUsVCrHBH1JG9gWlo548kYhAMPtN6zYewzCqxUxj8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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