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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f684b41fbc17e89ef8d2ba60468b5ba34b0d16f60cf7b78b14dd4adc2458586d' 
  AND token = 'b4nHlZBXwY3jKM/nf+nMeR0AiW6+wYjw+Es6z2IinSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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